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The chemical formula indicates that the acid is composed of two atoms of carbon, four atoms of hydrogen and two atoms of oxygen. It is a weak acid that is part of a group of acids known as carboxylic acid. Ethanoic acid is a common component of vinegar. It is most often used in the production of various chemical compounds. Ethanoic acid has a molar mass of 60.05 grams per mole and a density of 1.04 grams per cubic centimeter.